Paint Quantity Calculator

Room length m

Measure the longest wall, then the wall at right angles to it.

Room width m

Ceiling height m

Floor to ceiling. Victorian rooms are often 2.7 m or more, which changes the answer noticeably.

Number of coats

Two for a colour change. Three when going from a strong colour to white or over fresh filler.

Coverage on the tin sq m per litre

Emulsion is typically 10 to 12 square metres per litre per coat. Use the figure printed on your own tin.

Doors to deduct

A standard interior door is about 1.9 square metres, both faces.

Windows to deduct

A standard window is about 1.4 square metres.

Tin size litres

Common sizes are 1 litre, 2.5 litres and 5 litres.